Detonation of CHO working substances in a laser jet engine

Ageichik, A. A.; Repina, E. V.; Rezunkov, Yu. A.; Safronov, A. L.

doi:10.1134/s1063784209030128

Cited by 16 publications

(3 citation statements)

References 10 publications

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“…Laser ablation in a nozzle under ambient atmosphere can be characterized with respect to various baselines. The usage of data from uncon¿ned, Àat targets has been presented for laser ablation inside conical nozzles in [18], whereas laser ablation in re-Àecting parabolic nozzles [7] and advanced devices [24] has often been referenced with respect to data from pure air breakdown. The latter method underlines the impact of the propellant, whereas the ¿rst one highlights nozzle effects.…”

Section: Nozzles and àAt Targets In Ambient Air (Nagoya -Stuttgart)mentioning

confidence: 99%

Review on Japanese-German-U.S. Cooperation on Laser-Ablation Propulsion

Sinko¹,

Karg²,

Röser³

et al. 2011

AIP Conference Proceedings

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We report on an international cooperation between Nagoya University (NU), Japan and DLR Stuttgart, Germany on scaling issues in laser ablative propulsion. Lessons learned from collaborative work in the laboratory will be summarized with respect to the comparability of experimental methods and corresponding standardization issues. With the background of previous experimental research at the University of Alabama in Huntsville (UAH), experimental work with CO 2 lasers in a moderate (NU) and high (DLR) pulse energy range on laser ablation of POM is presented. Pro¿lometry results of target surfaces are compared with Àuence distributions from beam propagation modeling. Ablation from Àat targets is reported with respect to energy and area scaling and compared with results from ablative propulsion employing parabolic nozzles.

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Section: Nozzles and àAt Targets In Ambient Air (Nagoya -Stuttgart)mentioning

confidence: 99%

Review on Japanese-German-U.S. Cooperation on Laser-Ablation Propulsion

Sinko¹,

Karg²,

Röser³

et al. 2011

AIP Conference Proceedings

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“…The lost energy is not at all negligible. Recent work by Larson et al [7] and Ageichik et al [8] with various laser propulsion propellants will stand to illustrate the challenge. To date, laser propulsion in vacuum has been challenged by low efficiency, and various methods were tried to enhance the propulsion performance of a target, such as doping with an absorbent material [9], loading the target with metal flakes to trigger plasma breakdown [10], or using exothermic decomposition in ablation in which therm can be larger than unity [11].…”

mentioning

confidence: 99%

Laser Ablation Propulsion Performance of Surface-Modified Polyoxymethylene

Sasoh

Ogita

Shikida

et al. 2012

Journal of Propulsion and Power

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The effects of the micrometer-scale surface morphology of polyoxymethylene on propulsion performance induced by transversely excited atmospheric CO 2 laser pulse ablation were investigated. Two methods were examined for producing a surface structure on the same order as the laser wavelength, 10:6 m: hydraulic compaction of powder and etching using microelectromechanical systems technology. With the compacted powder, the fluence for maximum momentum coupling coefficient C m shifted to a smaller value of 7 J=cm 2 from the corresponding value of 15 J=cm 2 for bulk material. However, mass consumption was increased, thereby lowering specific impulse I sp . Three surface patterns were examined with the microelectromechanical systems etching, obtaining an up to 20% increment, both in C m and I sp .

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“…[13][14][15][16] Laser ablation of polymers in low background pressures ( 1 Torr) has drawn relatively little attention, however, perhaps because of the complex physicochemical properties of polymer samples and the relatively low visibility of shock waves formed at low pressure. 9 The promising performance of energetic or otherwise exothermic polymers in laser ablation propulsion applications [17][18][19][20][21] signals the need for a better understanding of the plumes produced by laser-polymer interactions in the presence of background gases of varying pressure and chemical nature. An understanding of the properties of the plasma plume and its interaction with the surrounding environment is key to envisioned space launches using ground-based lasers, for example, since the propulsive efficacy of the plume will be affected by the decline in ambient pressure with increasing altitude.…”

Section: Introductionmentioning

confidence: 99%

Imaging spectroscopy of polymer ablation plasmas for laser propulsion applications

Jiao

Truscott

Líu

et al. 2017

Journal of Applied Physics

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A number of polymers have been proposed for use as propellants in space launch and thruster applications based on laser ablation, although few prior studies have either evaluated their performance at background pressures representative of the upper atmosphere or investigated interactions with ambient gases other than air. Here, we use spatially and temporally resolved optical emission spectroscopy to compare three polymers, poly(ethylene), poly(oxymethylene), and glycidyl azide polymer, ablated using a 532 nm, nanosecond pulsed laser under Ar and O2 at pressures below 1 Torr. Emission lines from neutrally and positively charged atoms are observed in each case, along with the recombination radiation at the interaction front between the plasma plume and the background gas. C2 radicals arise either as a direct fragmentation product or by a three-body recombination of C atoms, depending on the structure of the polymer backbone, and exhibit a rotational temperature of ≈5000 K. The Sedov–Taylor point blast model is used to infer the energy release relative to the incident laser energy, which for all polymers is greater in the presence of O2, as to be expected based on their negative oxygen balance. Under Ar, plume confinement is seen to enhance the self-reactivity of the ejecta from poly(oxymethylene) and glycidyl azide polymer, with maximum exothermicity close to 0.5 Torr. However, little advantage of the latter, widely considered one of the most promising energetic polymers, is apparent under the present conditions over the former, a common engineering plastic.

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Detonation of CHO working substances in a laser jet engine

Cited by 16 publications

References 10 publications

Review on Japanese-German-U.S. Cooperation on Laser-Ablation Propulsion

Review on Japanese-German-U.S. Cooperation on Laser-Ablation Propulsion

Laser Ablation Propulsion Performance of Surface-Modified Polyoxymethylene

Imaging spectroscopy of polymer ablation plasmas for laser propulsion applications

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